The correct option is C At the cristae
The organized layers of folds that characterize cristae greatly increase the total surface area of the inner membrane of mitochondria. The larger surface area means that there is more space for the series of compounds that make up the electron transport system to carry out the process of releasing food particles in the cell to generate energy. These features of cristae allow for a faster production of ATP in the inner membrane of the mitochondria during the final stages of cellular respiration.